Long note

Hold one note as long and as steadily as you can. It trains support and breathing. Your record is saved.

Microphone needed

Sound is analysed right in your browser and never uploaded. The browser will ask for permission once.

Wear headphones when singing over a track so the music doesn't leak into the microphone.
Audio interface with two inputs (Scarlett, etc.): the voice is found on either input automatically, and you can pick the channel in Settings.
Level: loud parts should reach the yellow zone of the meter, but not the red.

How to train breath support

Breathe in deeply into your belly, shoulders down. Take a note on "ah" and hold it calmly and evenly, without pushing.
Time within a semitone of the target counts, in any octave.
At the end you see the average deviation, the wobble and the drift towards the end — that shows where your support runs out.

The goal for the first week is 15 seconds, then 25 seconds and steadier at the end.